Move the iOS user agent functions to ios/web/public.

ios/web/ios_web.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
+  'variables': {
+    'chromium_code': 1,
+   },
   'targets': [
     {
-      'target_name': 'language_usage_metrics',
+      'target_name': 'ios_web',
       'type': 'static_library',
+      'include_dirs': [
+        '../..',
+      ],
       'dependencies': [
-        '../base/base.gyp:base',
-      ],
-      'include_dirs': [
-        '..',
+        '../../base/base.gyp:base',
       ],
       'sources': [
-        'language_usage_metrics/language_usage_metrics.cc',
-        'language_usage_metrics/language_usage_metrics.h',
+        'public/user_agent.h',
+        'public/user_agent.mm',
       ],
     },
   ],
 }